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Waste of money, more than 1,500 USD spent and the delivery rate is awful, you have to request delivery report after 24 hours and it never comes, you have to re-request from live support and they promise within 24-48 hours and again it never comes, you have to beg them to send report, and you receive only 1 of 10 requested reports
When you receive report you will not find all SMS you've sent so you will recognize why do they hide and delay reports!
Live support is almost nothing, they will never give any useful information, they will just act like ok soon, every SMS will be delivered soon, we will inform department, we will check, and nothing more, it would be better to talk to yourself facing the mirror other than talking to live support
If you don't want to lose your money and your REPUTATION never use 1S2U service
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